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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62a9096aa9491a2230e3fe87f0d8d2ad8869689a130235e0f1bb348b31139b9' 
  AND token = 'eynWsmD+ViFgmw/edH5FLSJtPotraP5lAabYgA3i1Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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