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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c0ec046d3e2efd18f341f6c0377b084c1458d5b7dc5aaa51c00982c9c6efa3' 
  AND token = 'OqUUEuvtMObaPFGn1RKlm6IV3u+KGMw3W6idnYHNbcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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