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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae719e7c0a78aeb74f403ec9b7a7acca7aa578d9fbd3a96333d856695879669' 
  AND token = 'y8sm8T6tU8+8DVz87Rt7Ni081eqhy/qtdtlHWPimEV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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