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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4732ab75e0820ee7f27aa9d0ef374c6982e6a6689072b030925d60d5e0c09a4d' 
  AND token = '9MnFEGJzFd/GWNCuXbAOVTGW3r60oVztLEoR3FRCETM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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