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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb0d8a5c76cb7e41abafa0c5292c3f89b8b0e703386db91ca8cd43641d477eb' 
  AND token = '89AmVkpwbGCTVIfhzykf3M5/21CmK4SPdOvyAmWqN5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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