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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c28e100966eb19c78927f532446d65c106628a698b9b1ad8c262881907ee8f' 
  AND token = 'pjgpoaE7wkPuDnULmxxIHPvwv3f8aMIWwUh2bNq3b8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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