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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191043f92c412abb55b230d56bfff5e4b34dcebf0ffe23be988a5015a54282b0' 
  AND token = 'X3pxUTfGD0gW7caNX3xLufviy8m/mJlJt0UN9/BW04M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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