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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4c16dd3c9bd79bb307480f5cba938afdd2a21211a5ee8f7892c0b726658634' 
  AND token = 'DIauCiErk1UOcnRaTyKuDrayUo3yAVywcrXvBIryx1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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