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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2211df1cd722ad8ad41a6c07046f9c90aabb0198e936c0326bc3836bc23e687e' 
  AND token = '+BKPuauXeHL6kwboRSi8kP/d0HJJ6NcoK63FtazPMbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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