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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860d9a1bac8ea4142e1b78a922a5895069ca3c9aac4dc8c298227f2201bd9f61' 
  AND token = 'yLtGbQMmFEDqPfpUsIyGQv4hH0a5+wCAeuDKYDNLQ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}