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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd5019a9d2df147d059d20568dfa95c67f958c7c61e0ae2010c4c4ee53a1a93' 
  AND token = '5qo9aOukuvfHi56CT0STusPsFRZf8rK3wNT/nVy3yGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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