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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744a9dc347f1c613085180c5b6ec8cf5aa7fb0a34e5f21b4c24e7ae8e2ec370c' 
  AND token = 'Djkc/ic0ur1Tj1RubsTe70aekgu/wHK/+B8LDL48WuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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