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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed08e4fe986c97369dbbc0b2a6323ba858d5958b8f0d8c389bff027f5958b56' 
  AND token = 'NHjv2ZS6JaKICBkwS71kyQvTo04svIKDMk7XaJB5WHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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