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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07156a160ff6c817849ce2a9803144a4a23916cffdbcd5973c2e0cd9a14d3ea' 
  AND token = 'x4eBxGmUdxzQkXLxFeKefH9A5q2RFcFd1aIiiiEOkB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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