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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639b68d8fe17c2cacaaae1ea8a7d82a04a37b429d0ff56e280d70481910d3463' 
  AND token = 'LFAg4x2EyxV3H7r4zDGLztVhp9a3FtwtzD3Irzs2P9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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