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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d728b0b4d98901903bd8eb438d1de0cf44d717a8ebe631b18030f8a4b1c1c7' 
  AND token = 'jpJNTtvtrqn64MzyASAoKXGwu+FZgauHg/IC3hpFis8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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