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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158cb9480e5e1bbdf8f8050bb99ad21d9b7c4b89db18688d53ad9a072c895dc5' 
  AND token = 'rgHLUELcfurnMjQaw9A0rvq6TQZvcn3rrIRrq3bXkvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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