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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e04f9dd6aa611d74de0f186fc400804b1e2688a75a476bb35fd045fb2a7b11e' 
  AND token = '2Vso0Ko8TXBWHagBn+ZAO2u6ufwKBgOejVnOQkgc0o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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