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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cabe4478886827f84dd667636ab43d8a2b8a10010b456edfe79f532bb7aa5d9' 
  AND token = 'Tk3vcAotw5woicPmjPDtMVhkVCAmFL+E6FRR2JhGlpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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