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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3206d680ffee1c9e7e8c7596f100a2df18e4b78c7e8819ea54be027b8b9a8e7' 
  AND token = 'VGLvM5ausOa+6L+dGiT4cS8Az/Kt5cLstj17qvHHl/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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