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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efd32ca5149ad58fb07b6a17af338a4e7e05edd3c14053a4e5e3a2ff04e3467' 
  AND token = 'KnHBZRGEW6XfXN3EKp8O1Okjudriy4VV3MSrkwPmf9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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