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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697e6cc58ed96d5c636448d45b7f189243bac99ba5b44f838f1e9c4572477921' 
  AND token = 'cuaM6LFjx0hrOdcQ+k8X7XnErXTb4Dk7SPIXJOxqIR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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