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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b420318c8cc8ac39a27c56640bbead78656c70f76fdded2d4fd3e826a54ffd4a' 
  AND token = 'PZpU2y19vOiTAJNyXrIT6/zgIzFAiusXNkn63xkb9L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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