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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e24836b042cc011506317a7a628ee7eb88bb4776d88740ee1686286155866c' 
  AND token = 'ls/nlsERqvcnNwoV0v+1r+f7VRmMR640sxVXhIC7g2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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