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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693a943aad2fbbc03dfa402eb5eae7c27367cde46e6317a9d215f82d8914c390' 
  AND token = 'uiwifO7iOZhyz3d4YOvz91GnRo3ByPS4g8mFt8N7hBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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