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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cf2906b55a358bba3bcaf43d5d79220a4efebc361c1e538af5d2d5ccfa9f71' 
  AND token = '5PSCDacBJ/6pIhnI+yRZEX+QkR7SctYleAvQmu1QeHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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