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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfec46a21f6c47a1cc39395adbc9e80a72e5f49c2f6fe909c02fee3ae8064da0' 
  AND token = 'WDHm302ltiEEExFbcGemMFZaPXz6gctDS7HiJCJVIlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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