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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f616d18f0135a27d706d060497ef5f74cd5d9daeb7d552fb5ff5c1b71b352c' 
  AND token = 'AZjkrYP2Dy47x9CeldKwZTtpRA2Rm7kCRbNbMmr5Ydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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