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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c8983e9628371de2a0f1f52cb7f773c58478b914887e86f94743d57f47aaf7' 
  AND token = 'GeFNxam4gKmfbIee693KLJ81CqFixdAHRgLBdIvRTMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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