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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cc099451a168f5dc93085ed1171e7368c29825aa746489294d3d488d58f3fb' 
  AND token = 'g7EyysykdUWhMWZCTbtWsJuXpVxsdCozVxSBQr32enk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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