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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41fc25286c4bc9f546f9e3ae6d8e4c547516556a23d80108ee948c078591a02' 
  AND token = '0Ut6SLX7L30GXN1/F0/cfHwWRwyiepuKrZpraxBHaNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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