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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abc6bc0ee7b9d5d205f67672a469510e0b5fedd6e56bf3358b30f564c84d5f7' 
  AND token = 'zDfaJrGjx1VzAK0pN4f1ADi90/ab5dL/awMEy/9Wv9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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