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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ed58866bfc09916e6277187fa1ede18d15936040064cbdfa2e0a159ef3b96b' 
  AND token = '0DYrYzWCWk+34jvBC446ETt69KIcNcaWuSM5hqYq6oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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