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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b6a7a4761669f91a5e2379326a52b96f7c7250f036a7a3b73befda15334eb7' 
  AND token = 'Xcb/kt7N6CGk5m3mn/XD/ZHEKN7Kums1qUJSH1fvT5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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