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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1891bdcf4de9fc47862629f886024121814594f46e5ab0f9629961e63ca25f' 
  AND token = 'lTSEOhQir9NAVPIriPMBzz0wzHq2EPrNh5BAP0J9xTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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