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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d56ea523b3422af30ee959fce629020f063754ffab1a9ca14ac3418769c3664' 
  AND token = 'YUOG8Bbu44xDH22TRneRqqnbFHrXrQ1kwRpXF+26kCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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