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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa6961b94bbed7a97336041e74ea67487e82dc4c746633ed33a86feeb0360cd' 
  AND token = 'XA1ylqV/FTX+zGbXF4yZk4BoJMZnG72b3Ij+3hnuv+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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