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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713fab8baf84c8349ef06a04f588c8cd39404d602f4a14446f23ffd6dc492f2e' 
  AND token = 'rCNAE6O/fuH1P1C3m+VfQxkqT6hYiylyBCdpXmlylMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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