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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f28a0fd54c2b50f2fb8b402188447ef73e4e205f5ae22c73821274d95acd36' 
  AND token = 'cAYfSyT5zUjjsJcR8X4ttE5PIVXRKJHPZzKCL66N67U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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