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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029c1e7b2c9eef0c1066f2667b5b41f94625a80867f6262b49e385da71752cb6' 
  AND token = 'r4MTbRAsFSaZdK+V6dp7eIb9WIn2uqsL7s2XpsAO6D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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