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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467ea4a1c81d6ba076e535454c136ff0e130f22a706d18fa8625cf903d2c6826' 
  AND token = 'GY8dFyj6KRgda0BOVeom1GdPScRi0VHtIsz5lkPxsVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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