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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d293fb638e53c8d7ae3cd898ec445e56014137db5b9087af49bc39a94fbcf8f' 
  AND token = 'Vku49Vz4PzLXQfCTbb9aI6P7H0N/GnuSCel3rle3sFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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