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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254000387f4cb890432591886614d192ac97696ac8d0b09736b587ed1724331e' 
  AND token = 'sKLYLyveli1axJMgD2eGKizmi2i13X5TfnK2BO/ZufM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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