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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad749abf17a934660e71517411bee540e942b301b7150c1609e82fca75342648' 
  AND token = 'IfZiNrsugwnyWWHAAeXed11VEGjUQNKMyxiY98dS60A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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