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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed79e5a1ce9e5605712f84dd0305143f1cc53798b5e2034ffae621809ef85d9b' 
  AND token = 'v5bi4bzVmp6qNB8omypYQiurnbSIynOKWLNn5KTRAP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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