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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab07257724e78ded7547633b44b2621955240fb4ee61998194bd73e7613e0cb' 
  AND token = 'Sytdf7X+xpq2+I3ndixfLFGup+FCBP6q/r0kDzctcOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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