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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e1c725b5847ec3b65a1df8747dcb373c8bfc23ba8213a8b0907b0ba9b5afc0' 
  AND token = 'TnpRT2kI5OEPENFSGdap52kzJElYywhauj12oDH3ZjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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