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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a0c3474e711a7d51f37ed9a22dc5d76c1b6768224709af5e877e0cdb66fbc6' 
  AND token = 'yiDVTaASFU3XP/ij41ZlPWRkNo+OI17v3edWoj2pz6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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