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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7aa6e6a706fb3e8ac46f604fa5b2f9321a063a0d64a2546f29e22e92c6a10ab' 
  AND token = '6nbeF2W5WZE2P2z2GOcNdBtitlOuNW1FXn43BRIc9V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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