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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d56e731d4375e64bd6183a0f572cd977f2694222fc75d21387a61a2c39a84d4' 
  AND token = 'BZTfXPbd5qY3pbNMGss6e7LohGNAGVEOy1lyZfJXMjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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