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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3912bd30d60ae69a947874dc41a226267dfc859ec7e5f37305092ef4a4608e' 
  AND token = 'aWMDJnVhYhRXkPAvRu88bmbLPfrA1w1T3OOMD9VzFbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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