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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5b6ceb5f34ba387cfdcfd546fac68772e7016f187df3b173776adf036dddc3' 
  AND token = 'fyqldDDJ1L9+ALv2U0yRhggJxqhausV5K4pxgKgAIf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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