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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ac84d2850e4d893ea84816a925c9ea20ab22e6ef3ae6c216267bde78bd1fcd' 
  AND token = '4vuVNO+H0ZRqRoHIKYaqXjcQuGbtkF1Og3uJ6v0UyNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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