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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a2f1e1005adac7509f0547fbc50e3828ea96f9f457623cf42de1380cee45ee' 
  AND token = '0MwQ8Mm0WNV+3VoWgtRlYotRHV9fMgdTbeaOQo0JKd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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